Rotary pump



June 4, 1935. c. sMnl-l E1'- AL 2.* 003615 ROTARY Puur Filed Aug. 10;1953 if? s /a P-,2 Za 2/ .s2 f l E95. MM

Patented June 4, 1935 PATENT orrics aorAaY rom Charles Smith, Albert E.Prohaska and Albert L. Wilson, Denver, Colo., assignors of one-fourth to0. B. Schmidt, Denver, Colo.

Application August 10, 1933, Serial No. 684,521)

4 Claims.v (Cl. 103136) journals Il preferably provided with suitable yThis invention relates to a rotary pump. Rotary pumps of the pressuretype have not been commercially successful owing to the fact that whenoperating against heavy pressures or upon fluids containing abrasivesubstances, the pumps are subjected to rapid wear and deteriorationwhich soon renders them useless or inelcient. The principal object ofthis invention is to provide a rotary pump construction in which thisexcessive wear will be eliminated or greatly reduced, and to provide apump which can operate against high )pressures indefinitely.

in the usual rotary pump, the pump vanes are pressed against theinterior of the housing by centrifugal force, and, in some instances, bysprings. This excessive pressure increases with the speed that the pumpis operating causing a high coeicient of friction and a rapid wearingaway of the vanes and walls. Another object of this invention is toprovide a construction by means of which the vanes can be prevented fromcoming in actual contact with the housing walls lso that wear at thispoint may be entirely eliminated.

Another disadvantage of the usual rotary `pumps resides in the fact thatthe uid being pumped leaks into the bearing for the pump shaft so as tocarry foreign materials thereinv ing drawing which forms a part hereof.Like numerals refer to like parts in all views of the drawing andthroughout the description.

In the drawing:

Fig. 1 is a vertical cross section through a rotary pump in which thefeatures of this invention have been embodied. lThe section in this viewis taken on the line I-I, Fig. 2. d

Fig. 2 is a longitudinal section through the pump of Fig. 1, taken onthe line 2 2, Fig. 1.

Fig. `3 is a detail section through-a portion of the pump rotor andvane, taken on the line 3-3, Fig. 1.

The improved pump consists of a cylindrical pump chamber I0. Each faceof the pump .chamber I isr closed by means of a circular face plate Il.A shaft l2 passes completely through both face plates il and through thepump chamber I0. Packing glands I3 are provided to prevent leakage aboutthe shaft' I2. The shaft I2 is supported in a pair of out-board ballbearings Il', The journals Il are supported from the face plates II uponsuitable strength-,- ening ribs I6 cast or otherwise formed thereon, Itwill be noted that the shaft I2 passes through the pump chamber l0eecentrically, preferably, but not necessarily, above the center line ofthe chamber.

A circular rotor Il is keyed to the shaft I2 within the chamber I 0.This rotor is of a diameter to bring its periphery closely adjacent kithe inner wall of the chamber Il) on the of the greatest eccentricity.

The rotor I'I is provided with a series of lateral, radially extending,slots I8 in each of which a vane I9 is arranged to reciprocate. Thevanes I9 have avthickuess substantially equal to the width of the slotsI8 and are of a width to substantially fillthe space betweenV the headsII. The friction between the vanes and the rotor is relievedby means ofroller v side44 bearings 20 which are positioned at each side of eachvane within the rotor I1.

Each vane is longitudinally bifurcated to vform a slide for a sealingblock 2I, each of which carries a rotatable sealing bar 22. The

blocks 2| may be moved outwardly or inwardly' to vary the space betweenthe sealing bars 22 and the inner vsurface of the pump hamber `lli bymeans of a pair of wedge blocks 23. The wedge blocks 23 are mountedin'pairs in each vane upon threaded rods 24. The-threads at vtheopposite extremities of the rods 24 are opposite hand, so that as therod is rotated, it

A full oating wheel shaft 21 extends longitudinally through each of thevanes I8 and is preferably `journalled therein on roller bearings- 23. Abearing wheel 29 is secured on each extremity of each wheel shaft 21.The bearing wheels 29 travel in a circular indented track groove v3B ineach face plate il. The tracks 3|! are concentric with the axis ofthepump chamber l0 and the width of the track grooves 3b is substantiallyequal to the diameters of the wheelsl.

The pump chamber l0 is provided with fluid nipples 3l and 32 andpreferably with a supporting base 34. The face plate may\be detachablyclamped to the pump chamber Il by means of suitable bolts 33. f It isdesired to call attention to the fact that either of the nipples 3l and32 may be employed as the intake, the remaining nipple being thedischarge, depending upon the direction of rotation of thelrotor Il.

Operation Let us assume that the rotor I1 is turning clockwise, in'which event the nipple 32 would be the intake and the nipple 3| thedischarge. The wedge blocks 23 are adjusted so that the sealing bars22will closely approach the inner wall of the chamber |0 at the top andbottom sides of the chamber. It is desired to call attention to thefact,'however, that the`wedge blocks prevent, owing` to theirdove-tailed construction,` the, sealing bars 22 from actually touchingthe walls. They may however be brought to within'1/1000 of an inch ofthe walls if desired.

^ The fluid being pumped ilows into the chamber |'0 in the rear of eachvane. The following vane then, owing to the eccentric position'of thewheel tracks 30, closes oif the uid from the intake andforces it towardthe outlet 3| as is usual in rotary pumps. At no time, however, is therefrictional contact between the vanes andk the pump wall to cause wearingaway of the vanes and wall.

Immediately below each nipple 3| and 32, a chamber wall is inclinedoutwardly as shown at so as not to restrict the intake or dischargepassages. It will be noted that, at the positions 35, the vanes arewidely separated from 4the walls, owing to the circular contour of thetrack grooves 30, and the non-circular contour of the pump chamber wall.This allows a wide `unrestricted' channelfor the inflow and outflow Lpump operates practically without sliding frictional contacts. It willbenoted that should there be any leakage through the packing 'glands I3,it cannot reach the bearings l5 as it will be thrown from the shaft inthe open space between the packing glands and the bearings. v p Asmallflange 36 may be formed on the peripheral edges of the faces of therotor I1.

Each of the anges 36 flts snugly into` a circu'- lar groove 3l in eachface plate The flange tends to prevent leakage past the faces of therotor While a specific form of the improvement has been described andillustrated herein, it is desired to be understood that the same may .bevaried, within the scope of the appended claims, without departing fromthe spirit of the invention. Having thus described the invention, whatis claimed and desired secured by Letters Patent is: Y

l. A rotary pump comprising: a cylindrical housing; a. rotoreccentrically mounted within Vsaid housing so that its periphery willclosely l approach one wall thereof; vanes slidably mounted in radialslots in said rotor; means for maintaining said vanes in close proximityto, `yet separated from, the wall of said housing during theirrevolution; a fluid inlet at one side of said rotor; a fluid outlet atthe other side thereof;'a sealing blockslidably mounted in alongitudinal slot in the extremity of eachA vane; .means interposedbetween the vane and the block to project or withdraw the latter, saidmeans comprising: wedge members between said bloclf and said vane; andmeans for actuating said wedge members.

2. A rotory pump comprising: a cylindrical housing; a rotoreccentrically mounted within said housing so that its periphery willclosely approach one wall thereof; vanes slidably mounted in radialslots in said rotor; means for maintaining said vanes'in close proximityto, yet separated from, the wall of said housing during theirrevolution; a fluid inlet at one side of said rotor; a fluid outlet atthe other side thereof; a sealing block'slidably mounted in alongitudinal slot inthe extremity of each vane; and means interposedbetween the vane and the block to project or withdraw the latter, saidmeans comprising: inclined surfaces on vsaid block provided withdove-tailed grooves,

there being a dove-tailed groove in said vane oppositeV said iirstgrooves; and dovetailed wedge blocks co-acting with said grooves toproject or withdraw said sealing block as desired.

3. A rotary p'ump comprising: a cylindrical housing; a rotoreccentrically mounted within said housing; vanes slidably mounted inlaterally extending radial guideways in said'rotor; each of said vaneshaving a slot extending longitudinally along its outer end; a sealingblock slidably mounted in each slot so as to extend beyond said vane,the bottom of each sealing block having an inclined surface; a wedgeblock positioned between the bottom of said`slot and said inclinedsurfaces; means,I for moving said wedge block so as to force saidsealing block outwardly or draw it inwardly so as to increase ordecrease the length of said vanes as desired; saidl means includingdove-tailed connections between said inclined surface and said wedgeblock and betweenv the bottom of said slot and said wedge block so thatthe latter may exert a pulling as well as a pushing action.

4. A rotary pump comprising: a cylindrical housing; a rotoreccentrically mounted Within said housing; vanes slidably mounted inlaterally extending radial guideways in said rotor; each of said vaneshaving a slot extending longitudinally along its outer end; a sealingblock slidably mounted in each slot so as to extend beyond. said vane,the bottom .of each sealing block having `two opposed inclined surfaceson its bottom; a dove-tailed spline extending along the bottom of saidslot; a wedge block in each extremity of said slot in interlockingengagement with said splines; and a threaded rod passing through bothsaid wedge blocks so as to actuate them toward or away from each other.

CHARLES SMITH. ALBERT E. PROHASKA. ALBERT L. WILSON.

